"This is new for us. He's never had any operations on his organs before," his mom, Leanne Lane, told ABC News. "He gets upset. He just says 'mummy and daddy' over and over again, but we'll be outside waiting until he's awake."

Seth's story first went viral in early March when his family posted a video of the boy holding up signs to explain his condition. Because he has no immune system, Seth has to live in an extremely clean environment and have little contact with other people.

There are a lot of things that cheer him up, including the color yellow, so he asked everyone watching the video to wear yellow on March 27 to show support for him.

Friday went well, Lane told ABC News, and it lasted into Saturday for them because of the time difference with America, where the campaign picked up a lot of attention. Even celebrities like Ashton Kutcher joined in.

If Seth is ready, his mom said, the transplant will take place in about a month. His father, Nik, will be the donor. This will be his second transplant. The first, which was attempted in 2010, was unsuccessful.